Meta-analysis of Total Organic Carbon in Agricultural Soils Under Biochar Amendment Model

doi:10.11924/j.issn.1000-6850.casb2024-0644

Abstract

Abstract:

Biochar, a carbon-rich material renowned for its distinctive physical properties, holds significant promise for improving soil texture. However, the performance of biochar-amended soils is contingent upon a variety of factors, including the inherent characteristics of the biochar, the prevailing soil conditions, and the specifics of the experimental framework employed. In this study, we undertook a comprehensive Meta-analysis to assess the impact of biochar application on soil organic carbon (SOC) content. By synthesizing literature published between 2013 and 2024, we meticulously screened 207 datasets derived from 84 studies. The results indicated that the enhancement of total organic carbon (TOC) content in soils after biochar application was more pronounced under specific conditions: when the biochar pH < 9, the soil type was sandy, and the initial organic carbon content was low. Notably, the maximum increase in soil TOC, an impressive 53.43%, was observed in sandy soils. Furthermore, with the increase of biochar application, a corresponding rise in soil TOC content was also documented. This study elucidated the influence of biochar on soil organic carbon, integrating factors such as biochar characteristics, soil conditions, and experimental parameters. Through this comprehensive analysis, we aimed to underscore the significant potential of biochar as a transformative agent for soil enhancement.

Key words: biochar, total organic carbon, soil organic carbon fraction, Meta-analysis, soil improvement

SONG Kai, GAO Yu, ZUO Yutian, LIU Yang. Meta-analysis of Total Organic Carbon in Agricultural Soils Under Biochar Amendment Model[J]. Chinese Agricultural Science Bulletin, 2025, 41(9): 125-131.

Figures/Tables 5

References 50

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生物炭性质		土壤性质				生物炭施用条件
pH	制备来源	pH	土壤质地	土壤初始有机碳/ (g/kg)	土壤初始全氮含量/ (g/kg)	生物炭施用量/ (t/hm²)	生物炭施用时间
<9	谷类秸秆	<7	黏土	低(<10)	低(<1)	低(0~10)	<1 a
9~10	谷物残渣	7~8	壤土	中(10~20)	中(1~2)	中(10~20)	1~2 a
>10	木材	>8	砂土	高(>20)	高(>2)	高(20~30)	>2 a
						极高(≥30)

生物炭性质		土壤性质				生物炭施用条件
pH	制备来源	pH	土壤质地	土壤初始有机碳/ (g/kg)	土壤初始全氮含量/ (g/kg)	生物炭施用量/ (t/hm²)	生物炭施用时间
<9	谷类秸秆	<7	黏土	低(<10)	低(<1)	低(0~10)	<1 a
9~10	谷物残渣	7~8	壤土	中(10~20)	中(1~2)	中(10~20)	1~2 a
>10	木材	>8	砂土	高(>20)	高(>2)	高(20~30)	>2 a
						极高(≥30)